public class Test2 {
    public static void main(String[] args) {
        Student student1 = new Student("123");
        Student student2 = new Student("123");
        HashBunk2<Student,String> hashBunk2 = new HashBunk2<>();
        hashBunk2.put(student1,"jiangyi");

        String val = hashBunk2.get(student2);
        System.out.println(val);

    }
}
